A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
The time period of a oscillating spring is given by, \[T=2\pi \sqrt{\frac{m}{k}}\]Þ \[T\propto \frac{1}{\sqrt{k}}.\] Since the spring constant is large for hard spring, therefore hard spring has a less periodic time as compared to soft spring.
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